<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<script>
	function add(n){

 
　　if(n == 1) return 1;

 
　　else return n + arguments.callee(n-1);

 console.log(arguments.callee(n))
　　}
	add(4)
	</script>
	<body>
	</body>
</html>
